汇编课程设计_六路抢答器

我的课程设计，上传供大家参考 DATA SEGMENT TAB DB 06H,5BH,4FH,66H,6DH,7CH,07H,7FH,67H ;1~9的段码; BZ DB 00H DATA ENDS STACK SEGMENT PARA STACK 'STACK' DB 100H DUP(?) STACK ENDS CODE SEGMENT ASSUME DS:DATA,CS:CODE START: MOV AX,DATA MOV DS,AX ;8259A初始化 MOV AL,13H ;初始化8259A的ICW1 OUT 20H,AL MOV AL,08H ;送中断类型码基值,8259A的ICW2 OUT 21H,AL MOV AL,0DH ;一般中断结束方式,8259A的ICW4 OUT 21H,AL ;8255A初始化 MOV AL,98H ;置8255A工作方式 OUT 83H,AL XOR AL,AL ;B口、C口初始化 OUT 81H,AL OUT 82H,AL ;8253初始化 MOV AL,37H ;置8253通道0控制字 OUT 43H,AL MOV AL,00H ;置8253通道0计数初值为4000 OUT 40H,AL MOV AL,40H OUT 40H,AL MOV AL,73H ;置8253 通道1控制字 OUT 43H,AL MOV AL,00H ;置8253通道1计数初值为3000 OUT 41H,AL MOV AL,30H OUT 41H,AL MOV AL,0B7H ;置8253通道2控制字 OUT 43H,AL MOV AL,00H ;置8253通道2控制字 OUT 42H,AL MOV AL,00H ;置8253通道2计数初值为0 OUT 42H,AL MOV AL,00H OUT 42H,AL ;中断设置 MOV AH,25H ;设置抢答按键中断向量 MOV AL,0AH ;中断类型号为入口参数 MOV BX,SEG KEYINT ;DS：DX指向4字节地址 MOV DS,BX MOV DX,OFFSET KEYINT INT 21H STI ;使IF置1,开放可屏蔽中断 ;主循环